CN103781133A - Switching method under heterogeneous cellular network - Google Patents
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Abstract
The invention discloses a switching method under a heterogeneous cellular network, which comprises the steps of: calculating a switching active threshold HAT by user equipment (UE) according to an effective switching threshold EHT and an active index AH which are transmitted by a macro base station, and determining a coverage area of the switching active area HAA of the macro base station according to the acquired HAT value; determining movement direction by the current UE according to reference signal receiving power RSRP values of the macro base station and a micro base station; if movement from the macro base station to the micro base station is determined, determining whether the UE enters the HAA area of the macro base station according to the reference signal receiving power RSRP value and HAT value of the macro base station, thereby determining whether switching from the macro base station to the micro base station is required; and if movement from the micro base station to the macro base station is determined, determining whether the UE enters the non-HAA area of the macro base station according to the reference signal receiving power RSRP value of the macro base station, thereby determining whether switching from the micro base station to the macro base station is required. The switching method under the heterogeneous cellular network according to the invention has the functions of: improving resource utilization rate, and reducing system performance reduction and ping-pong effect caused by switching time delay.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the changing method under a kind of isomery Cellular Networks.
Background technology
Along with the application of data service type is more and more extensive, the day by day increase of user to data-rate requirements, conventional cellular network framework can not meet traffic performance demand, based on this, LTE-A has carried out the research of isomery Cellular Networks, is intended to improve the throughput of hot zones, improves indoor covering.So-called isomery Cellular Networks, refers to that heterogeneous networks node has the transmitting power of different sizes and dissimilar back haul link.Typical isomery cellular network node comprises: macro base station (macro cell) and micro-base station (small cell).Micro-base station comprises: femto base station (pico cell), Home eNodeB (femtocell) and relay base station (relay).Wherein, macro base station community is for providing the covering of wide area; Femto base station community is for improving the capacity in focus business area, the load of balance macro base station community; Home base station cells is used to personal user that better service quality is provided; Relay base station community is used for expanding the covering of macro base station cell edge, or is deployed in the place of being inconvenient to dispose wired back haul link.
Isomery Cellular Networks has changed the topological structure of conventional cellular network, has disposed so network nodes with different transmission power and coverage in system more simultaneously, makes network design more flexible.But along with a large amount of deployment of micro-base station, user becomes one of problem important in isomery double-layer network system at the mobility problem of micro-base station and macro base station.The intensive deployment of micro-base station and user's frequent movement, will cause a large amount of hand off signaling, wireless link handoff failure and unnecessary switching, how to reduce the impact of these signalings to network and reduce handoff failure and unnecessary switching is problem demanding prompt solution.
In prior art, mainly comprise following several changing method:
1) according to the demand of different handoff scenario, carry out different settings to switching relevant parameter, thereby realize for different adjacent cells and Target cell, adopt corresponding handoff parameter, adapt to the demand that isomery Cellular Networks is switched.But the method arranges correct handoff parameter, needs Multi simulation running, and is only adapted to special scenes, versatility deviation; And the method is not considered frequent switching, the impact of ping-pong.
2) improve the judging nicety rate that carries out mobile robustness in the network environment of macro base station and femto base station under isomery cellular network by improving mobile robustness.But it is limited that the method is improved the effect of performance of handoffs, and do not consider the impact of many factors, as handover delay, ping-pong etc.
3), by dynamic prediction user's switching time, to provide suitable user to switch time, thereby adapt to user's switching preparation process and current network state.But the method flow process in the time of specific implementation is slightly complicated, can increase signaling consumption, causes the wasting of resources; And the method is to be based upon handoff preparation phase, to the optimization of switching time, not consider in handoff procedure, frequent switching causes the impact of ping-pong.
Summary of the invention
The object of this invention is to provide the changing method under a kind of isomery Cellular Networks, improved resource utilization, reduced impact and the ping-pong of handover delay on systematic function.
The object of the invention is to be achieved through the following technical solutions:
A changing method under isomery Cellular Networks, the method comprises:
Effective switching threshold EHT that user equipment (UE) sends according to macro base station and active index AH calculate to switch and enliven threshold value HAT, and determine the coverage of the switching active regions HAA of macro base station according to the HAT value obtaining;
Current UE, according to the Reference Signal Received Power RSRP value that detects in real time macro base station and micro-base station, is determined the moving direction that it is current;
If from macro base station to micro-base station movement, according to the size of the Reference Signal Received Power RSRP value of macro base station and HAT value, determine whether to enter the HAA region of macro base station; Thereby determine whether to switch to micro-base station from macro base station; If move to macro base station from micro-base station, according to the size of the Reference Signal Received Power RSRP value of macro base station and HAT value, determine whether to enter the non-HAA region of macro base station, thereby determine whether to switch to macro base station from micro-base station.
As seen from the above technical solution provided by the invention, the effective switching threshold (EHT) sending according to macro base station and active index (AH) calculate to switch and enliven threshold value (HAT), thereby determine the coverage of the switching active regions (HAA) of macro base station; And according to the moving direction of subscriber equipment (UE) and UE whether in described HAA region, determine and noly switch from macro base station to micro-base station or switch to macro base station from micro-base station, when having improved performance of handoffs, improve resource utilization, reduced the impact of handover delay on systematic function; And, reduce handover overhead and the complexity that has reduced algorithm, reduce the impact of ping-pong.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain other accompanying drawings according to these accompanying drawings.
The flow chart of the changing method under a kind of isomery Cellular Networks that Fig. 1 provides for the embodiment of the present invention one;
The flow chart that a kind of macro base station that Fig. 2 provides for the embodiment of the present invention two switches to micro-base station;
The flow chart that Fig. 3 switches to macro base station for a kind of micro-base station that the embodiment of the present invention two provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on embodiments of the invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to protection scope of the present invention.
Embodiment mono-
The flow chart of the changing method under a kind of isomery Cellular Networks that Fig. 1 provides for the embodiment of the present invention one.As shown in Figure 1, the method mainly comprises:
Effective switching threshold (EHT) that subscriber equipment (UE) sends according to macro base station and active index (AH) calculate to switch and enliven threshold value (HAT), and determine the coverage of the switching active regions (HAA) of macro base station according to the HAT value obtaining;
Current UE, according to Reference Signal Received Power (RSRP) value that detects in real time macro base station and micro-base station, is determined the moving direction that it is current;
If from macro base station to micro-base station movement, according to the size of the Reference Signal Received Power RSRP value of macro base station and HAT value, determine whether to enter the HAA region of macro base station; Thereby determine whether to switch to micro-base station from macro base station; If move to macro base station from micro-base station, according to the size of the Reference Signal Received Power RSRP value of macro base station and HAT value, determine whether to enter the non-HAA region of macro base station, thereby determine whether to switch to macro base station from micro-base station.
Further, described in, determine whether to switch and specifically comprise to micro-base station from macro base station:
In the time that the RSRP of macro base station value is less than or equal to HAT value, determine the HAA region that enters macro base station;
Estimate by prediction that the RSRP of macro base station and micro-base station changes again and determine handover trigger threshold value (HTT), and according to the size between the RSRP value of macro base station and HTT value, determine whether to switch to this micro-base station from macro base station.
Further, when after definite HTT value, again compare the RSRP value of macro base station and the size of HAT value; Wherein, described HTT=EHT+PP; Described PP value is to calculate according to the RSRP value of macro base station the pre-triggering predicted value obtaining;
If the RSRP value of macro base station is less than or equal to HAT value, the size between RSRP value and the HTT value of macro base station relatively, or difference between comparison macro base station RSRP value and PP value and the size of EHT value;
When the RSRP of macro base station value is less than or equal to HTT value, or difference between macro base station RSRP value and PP value is while being less than or equal to EHT value, determines and switches to micro-base station from macro base station.
Further, the computational methods of described PP value are:
PP＝AR·τ；
Wherein, τ represents the switching delay time; The pace of change sum of the RSRP value of AR value representation macro base station and micro-base station.
Further, the computational methods of described AR value are:
AR=({ RSRP
macro base station(t)-RSRP
macro base station(t-Δ T) }+{ RSRP
micro-base station(t)-RSRP
micro-base station(t-Δ T) })/Δ T.
Further, the method also comprises:
Macro base station is determined EHT value according to the deployment types of the micro-base station of periphery, concrete: when described micro-base station deployment is during at Hot Spot, described EHT value is determined by the threshold value of RSRP value; When described micro-base station deployment is during at macro base station edge or coverage hole, described EHT value is the minimum RSRP value under macro base station covers.
Further, the described effective switching threshold EHT sending according to macro base station and active index AH calculate to switch and enliven threshold value HAT and comprise:
HAT=EHT+AH。
Effective switching threshold that the embodiment of the present invention sends according to macro base station and active index calculate to switch and enliven threshold value, thereby determine the coverage of the switching active regions of macro base station; And according to the moving direction of subscriber equipment and user whether in described switching active regions, determine and noly switch from macro base station to micro-base station or switch to macro base station from micro-base station, when having improved performance of handoffs, improve resource utilization, reduced the impact of handover delay on systematic function; And, reduce handover overhead and the complexity that has reduced algorithm, reduce the impact of ping-pong.
Embodiment bis-
For the ease of understanding the present invention, the changing method under isomery Cellular Networks described in embodiment mono-is divided into the switching of macro base station to micro-base station by the embodiment of the present invention by reference to the accompanying drawings 2-3, and micro-base station is introduced to switching two parts of macro base station.
1, macro base station is to the switching of micro-base station.
When user is by macro base station during to micro-base station movement, the mode that the present embodiment is estimated by active regions and prediction is improved and is switched system's energy, reduces the impact of handover delay on system, and can effectively prevent frequent unnecessary switching, to avoid the waste of Radio Resource, improve resource utilization.
The flow chart that a kind of macro base station that Fig. 2 provides for the embodiment of the present invention switches to micro-base station.As shown in Figure 2, it mainly comprises the steps:
Step 21: macro base station configures initialization information to UE.
In the process moving at UE, macro base station configures near the deployment scenario of micro-base station UE to UE.Wherein, the deployment of micro-base station can be divided into two large classes: the one, at Hot Spot; The 2nd, at macro base station edge or coverage hole.On this basis, can determine the size of effective switching threshold (EHT).Concrete: when described micro-base station deployment is during at Hot Spot, described EHT value is definite by the threshold value of RSRP value; When described micro-base station deployment is during at macro base station edge or coverage hole, described EHT value is the minimum reference signal received power value (RSRP) under macro base station covers.
Exemplary, near UE moves to Hot Spot time, for example, by (setting a threshold value,-5db), when the corresponding equal-5db of RSRP of this threshold value, guarantee that macro base station completes at this point in the switching of micro-base station, otherwise UE will continue deterioration at the signal quality of macro base station, cause wireless link connection failure RLF.In the time that UE moves to macro base station edge or coverage hole, get macro base station and cover lower minimum RSRP value, make to carry out and switch in the region near micro-base station as far as possible, save the power resource of system.
Then, can by determine switch enliven threshold value HAT define switch active regions HAA(Handover Active Area) coverage, thereby can correctly distinguish the invalid switching of user in the effective switching of user in active regions and non-active regions.Wherein, HAT=EHT+AH, AH(Activation Hysteresis in formula) represent to decide by it the size of switching active regions by active index.The isoparametric value of EHT and AH is all calculated, is measured by upper network layer and determines in the time that wireless network layer is planned, and notices to user.Wherein, EHT value is relevant to the deployment types of micro-base station, and described AH index is relevant to the speed of cell environment and UE.
Step 22:UE search signal, and Real-Time Monitoring.
UE constantly monitors the RSRP value of current service macro base station and the micro-base station of periphery, and it is ranked and the judgement of switch mode, determines whether user switches to micro-base station from macro base station.
Step 23:UE carries out switching type judgement.
If definite user is switched to micro-base station from macro base station, perform step 24; Otherwise, execution step 22.
Step 24: whether UE is entered to active regions judgement.
By comparing the RSRP value of macro base station and the size of HAT value, adjudicate in the HAA region that whether user is entered to macro base station, concrete: if the RSRP value of macro base station is less than or equal to HAT value, determine that UE enters the HAA region of macro base station, execution step 25; Otherwise, execution step 22.
Step 25:UE carries out pre-triggering to be processed, and determines and triggers switching point.
Determine handover trigger threshold value (HTT) by the pre-triggering processing to handover delay (i.e. prediction estimates that the RSRP of macro base station and micro-base station changes), guarantee to complete switching at effective switching point EHT, reduce the impact that handover delay causes algorithm performance.Wherein, definition HTT=EHT+PP, the PP (Pre-trigger Predictor) in formula represents the pre-predicted value that triggers.
The calculating of PP value is that the RSRP value to macro base station and micro-base station continuing by terminal is measured, and estimates the pace of change of RSRP, just can estimate PP value like this after the known switching delay time.Its expression formula is: PP=AR τ, wherein, switching delay time τ is periodically measured and is passed through by base station to notice to UE, AR(Alteration Rate) value carrys out the pace of change sum of the RSRP value of He Wei base station, Representation of Macro base station.For avoiding unnecessary frequent switching, can adopt periodic average measurement to estimate.
AR=({ RSRP
macro base station(t)-RSRP
macro base station(t-Δ T) }+{ RSRP
micro-base station(t)-RSRP
micro-base station(t-Δ T) })/Δ T.
Step 26: again whether UE is entered to active regions judgement.
Again compare the RSRP value of macro base station and switch the size of enlivening threshold value HAT, whether user is adjudicated in the HAA region of macro base station all the time.If the RSRP value of macro base station is less than or equal to HAT value, just determine that it is all the time in the HAA region of macro base station, execution step 27; Otherwise, execution step 22.
Step 27: whether UE is met and trigger switching condition judgement.
By relatively the RSRP value of macro base station and the size of HTT value, i.e. relatively the difference between macro base station RSRP value and PP and the size of EHT value, thus switching is adjudicated to triggering execution.If the difference between macro base station RSRP value and PP is less than or equal to EHT value, just perform step 28; Otherwise, execution step 25.
Step 28: carry out and switch.
Carry out the handoff procedure of UE from macro base station to micro-base station.
2, micro-base station is to the switching of macro base station.
Micro-base station has adopted asymmetrical simplification processing to the switching of macro base station, is directly to adjudicate and triggered switching based on HAT value, thereby has reduced handover overhead and the complexity that has reduced algorithm.In the time that user is switched from micro-base station to macro base station (algorithm wouldn't relate to the switch instances between little base station), consider that user may be near the covering fringe region of macro base station or the shade covering area (as indoor, the inferior situation of high building) of large base station, may cause so the frequent switching of user between macro base station and micro-base station, increase the load of base station.Therefore, the active regions threshold value HAT that is large base station by micro-base station to macro base station handover trigger Threshold in the present embodiment, when user is switched from micro-base station to macro base station like this, just directly in the non-active regions of stable macro base station, can reduce significantly unnecessary switching and prevent ping-pong.
The flow chart that Fig. 3 switches to macro base station for a kind of micro-base station that the embodiment of the present invention two provides.As shown in Figure 3, it mainly comprises the steps:
The specific implementation of step 31-step 32 and above-mentioned steps 21-step 22 are similar, therefore repeat no more.
If definite user is switched to macro base station from micro-base station, perform step 34; Otherwise, execution step 32.
Step 34: whether UE is met and trigger switching condition judgement.
By comparing the RSRP value of macro base station and the size of HAT value, the non-active regions that whether user is entered into macro base station is adjudicated.If the RSRP value of macro base station is greater than or equal to HAT value, just determine its non-switching active regions that enters macro base station, execution step 35; Otherwise, execution step 32.
Step 35: carry out and switch.
Carry out the handoff procedure of UE from micro-base station to macro base station.
Through the above description of the embodiments, those skilled in the art can be well understood to above-described embodiment and can realize by software, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, the technical scheme of above-described embodiment can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise that some instructions are in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (7)
1. the changing method under isomery Cellular Networks, is characterized in that, the method comprises:
Effective switching threshold EHT that user equipment (UE) sends according to macro base station and active index AH calculate to switch and enliven threshold value HAT, and determine the coverage of the switching active regions HAA of macro base station according to the HAT value obtaining;
Current UE, according to the Reference Signal Received Power RSRP value that detects in real time macro base station and micro-base station, is determined the moving direction that it is current;
If from macro base station to micro-base station movement, according to the size of the Reference Signal Received Power RSRP value of macro base station and HAT value, determine whether to enter the HAA region of macro base station; Thereby determine whether to switch to micro-base station from macro base station; If move to macro base station from micro-base station, according to the size of the Reference Signal Received Power RSRP value of macro base station and HAT value, determine whether to enter the non-HAA region of macro base station, thereby determine whether to switch to macro base station from micro-base station.
2. method according to claim 1, is characterized in that, described in determine whether to switch and specifically comprise to micro-base station from macro base station:
In the time that the RSRP of macro base station value is less than or equal to HAT value, determine the HAA region that enters macro base station;
Estimate by prediction that the RSRP of macro base station and micro-base station changes again and determine handover trigger threshold value HTT, and according to the size between the RSRP value of macro base station and HTT value, determine whether to switch to this micro-base station from macro base station.
3. method according to claim 2, is characterized in that,
When after definite HTT value, again compare the RSRP value of macro base station and the size of HAT value; Wherein, described HTT=EHT+PP; Described PP value is to calculate according to the RSRP value of macro base station the pre-triggering predicted value obtaining;
If the RSRP value of macro base station is less than or equal to HAT value, the size between RSRP value and the HTT value of macro base station relatively, or difference between comparison macro base station RSRP value and PP value and the size of EHT value;
When the RSRP of macro base station value is less than or equal to HTT value, or difference between macro base station RSRP value and PP value is while being less than or equal to EHT value, determines and switches to micro-base station from macro base station.
4. according to the method in claim 2 or 3, it is characterized in that, the computational methods of described PP value are:
PP＝AR·τ；
Wherein, τ represents the switching delay time; The pace of change sum of the RSRP value of AR value representation macro base station and micro-base station.
5. method according to claim 4, is characterized in that, the computational methods of described AR value are:
AR=({ RSRP
macro base station(t)-RSRP
macro base station(t-Δ T) }+{ RSRP
micro-base station(t)-RSRP
micro-base station(t-Δ T) })/Δ T.
6. method according to claim 1, is characterized in that, the method also comprises:
Macro base station is determined EHT value according to the deployment types of the micro-base station of periphery, concrete: when described micro-base station deployment is during at Hot Spot, described EHT value is determined by the threshold value of RSRP value; When described micro-base station deployment is during at macro base station edge or coverage hole, described EHT value is the minimum RSRP value under macro base station covers.
7. method according to claim 1, is characterized in that, the described effective switching threshold EHT sending according to macro base station and active index AH calculating switching enliven threshold value HAT and comprise:
HAT=EHT+AH。
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| CN105101323B (en) * | 2015-09-01 | 2018-09-18 | 重庆邮电大学 | Pre-switch method based on the perception of high frequency switch area in isomery Cellular Networks |
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| CN112154710A (en) * | 2018-05-25 | 2020-12-29 | 瑞典爱立信有限公司 | Managing large-scale mimo base stations |
| CN113676953A (en) * | 2020-05-15 | 2021-11-19 | 上海诺基亚贝尔股份有限公司 | Method and base station for UE selection for mobile load balancing of RAN network |
| WO2021232181A1 (en) * | 2020-05-18 | 2021-11-25 | Qualcomm Incorporated | Methods and apparatus for improving handover |
| CN115474252A (en) * | 2022-10-31 | 2022-12-13 | 煤炭科学技术研究院有限公司 | Base station switching method and device and mining 5G wireless networking system |
| CN115474252B (en) * | 2022-10-31 | 2023-03-14 | 煤炭科学技术研究院有限公司 | Base station switching method and device and mining 5G wireless networking system |
| CN116546577A (en) * | 2023-07-07 | 2023-08-04 | 中赣通信(集团)有限公司 | Multi-base-station intelligent scheduling method and system for communication switching |
| CN116546577B (en) * | 2023-07-07 | 2023-09-26 | 中赣通信(集团)有限公司 | Multi-base-station intelligent scheduling method and system for communication switching |
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